JPH0118288Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a manual screwdriver in which the screwdriver is rotated by gripping the handle, and the direction of rotation of the screwdriver can be changed by a simple operation.

An example of implementation of the present invention will be described in detail below based on the drawings.

In the drawings, 1 is a machine frame, and 2 is a shaft provided on the machine frame 1. Two freely rotating drive gears 3a and 3b are fitted in parallel to this shaft 2. 4 is a spring whose one end is pivotally attached to the shaft 2, and the handle 5, which rotates about the shaft 2, biases the handle 4 in the opening direction. The two drive gears 3 are attached to the handle 4.
Switching mechanism 6 for arbitrarily switching and selecting one of a and 3b
It is equipped with This switching mechanism 6 includes a drive gear 3a,
two pawls 7a that respectively engage and disengage from 3b;
7b and these pawls 7a, 7b are connected to drive gears 3a, 3b.
direction to force the pawls 7a, 7b into the drive gears 3a,
Spring 8a, 8b to be engaged with 3b, pawl 7a,
7b in the opposite biasing direction against the elasticity of the spring 8a or 8b to remove one pawl 7a or 7b from the drive gear 3a or 3b (Fig. 1, (See Figure 2), pawl 7a,
7b and the drive gears 3a, 3b exhibit a latch mechanism, and when the handle 4 is gripped, one pawl 7a
The drive gear 3a or 3b with which the gear 7b is engaged rotates in one direction.

The switching pin 9 has a thick part and a small part, and the thick part is used as a pressing part for the pawls 7a and 7b, and the small part is used as a pressing part. When the thick part is located, the detail is located on the other claw 7a or 7b.

Reference numeral 10 denotes a shaft on which the pawls 7a, 7b are rotatably attached to the handle 4. Reference numerals 11a and 11b are freely rotating intermediate gears meshed with drive gears 3a and 3b, and bevel gears 12a and 12b are respectively provided in opposing directions on these intermediate gears 11a and 11b. Reference numeral 13 denotes a shaft that connects the intermediate gears 11a and 11b to the machine frame 1. Reference numeral 14 denotes a rotating shaft with one end protruding outside the machine frame 1 and having a driver 15 on the projecting end.A bevel gear 16 is provided at the inner end of the rotating shaft 14 in the machine frame 1, and this bevel gear 16 gear 1
It is always meshed with both bevel gears 12a and 12b, which are provided in opposing directions on 1a and 11b.

The present invention has the above configuration, and the operation of the present invention will be explained next.

First, when the switching pin 9 is operated and the thick part of the switching pin 9, that is, the pressing part is positioned on one of the pawls 7a, this pawl 7a is pressed in the opposite biasing direction against the elasticity of the spring 8a, and the driving gear 3a is pressed. It became a state of separation from the
On the other hand, the detail of the switching pin 9 is located in the other pawl 7b, and this pawl 7b is biased toward the drive gear 3b by the spring 8b.
b. When the handle 4 is gripped and rotated in the closing direction in this state, the rotation of the handle 4 causes the drive gear 3b engaged with the pawl 7b, which rotates together with the handle 4, to rotate in the direction of the arrow A in FIG. The intermediate gear 11b meshing with the gear 3b rotates in the direction of the arrow in the same figure, and the rotating shaft 14, which has a bevel gear 16 at its end that meshes with the bevel gear 12b provided on the intermediate gear 11b, rotates in the direction of the arrow in the same figure. The driver 15 provided on the rotating shaft 14 rotates in the direction of the rotating shaft 1.
It rotates with the rotation of 4. At this time, the rotating shaft 14
The bevel gear 16 provided on the other intermediate gear 11a also meshes with the bevel gear 12a provided on the other intermediate gear 11a.
1a is a driving gear 3a which is rotatably mounted on the shaft and is meshed with an intermediate gear 11a.
Since the pawl 7a is disengaged, it is in a free rotation state, and therefore, the intermediate gear 1 is rotated by the rotation of the drive gear 3b.
The bevel gear 12a of the other intermediate gear 11a that is meshed with the bevel gear 16 rotated via the bevel gear 1b and the other drive gear 3a that is meshed with the intermediate gear 11a are rotated by the rotation of the bevel gear 16. It will be rotated in the opposite direction of gear 3b.
Next, operate the switching pin 9 again to position the thick part of the switching pin 9 on the other pawl 7b, the detail will be located on the pawl 7a, and in this state, if you grip the handle 4 and rotate it in the closing direction, the fourth As shown in FIG. 2, the operation is completely opposite to that described above, and the driver 15 rotates in the opposite direction.

As described above, according to the present invention, the direction of rotation of the screwdriver can be changed arbitrarily by a simple means such as simply operating the switching mechanism provided on the handle, and moreover, the direction of rotation of the screwdriver can be changed arbitrarily by simply operating the switching mechanism provided on the handle. Since the bevel gear provided at the end is sandwiched between two facing bevel gears, rotation can be transmitted stably and reliably, making it an excellent manual screwdriver. It is convenient, has a simple structure, is easy to manufacture, and can be obtained at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway front view of the present invention, FIG. 2 is an explanatory diagram showing the switching mechanism, and FIG. 3 is a partially cutaway bottom view of FIG. 1. ,
FIGS. 4A and 4B are explanatory diagrams showing the operation of the present invention. 1... Machine frame, 3a, 3b... Drive gear, 4...
Handle, 6...Switching mechanism, 11a, 11b...
Intermediate gears, 12a, 12b...Bevel gears, 14...
Rotating shaft, 15...driver, 16...bevel gear.

Claims (1)

[Scope of utility model registration request] Two freely rotating drive gears are arranged in parallel on the machine frame, and a handle is provided to arbitrarily select one of the two drive gears and rotate it in one direction via a switching mechanism, and the A freely rotating intermediate gear is meshed with each of the two driving gears, and a bevel gear is provided in the opposing direction for each of the two meshed intermediate gears, and both bevel gears provided in the opposing direction A manual screwdriver characterized in that a bevel gear provided at the other end of a rotating shaft having a driver at one end is always engaged.